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Step 1
Begin outside and check all the seals on vents that lead outdoors. If you see any cracking on the seals, even if it doesn't go all the way through the wall, it could still be causing a draft.
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Step 2
Re-caulk all the seals that show signs of wear. Paint over the caulk for added protection. For roof vents, use black tar around the seal of a vent. Cover up any seams near the vents with roofing shingles.
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Step 3
Ask your regular maintenance people to check all your vents for leaks when they do their regular tune up on your HVAC system. This check can take an extra 30 minutes, but can save you money in the long run on high utility bills. They should also check vents on your heating and cooling system to make sure no dangerous leaks are getting into your home.
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Step 4
Make sure that automatic vents close completely when they are supposed to. Electronic or mechanical vents often get stuck, and you may not realize if they are closing properly. Listen to the slight clang of shutting when you close vents in the bathroom and kitchen as well as basement and ceiling vents.








